ABAP Select data from SAP table IENGSNPREFDOC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP IENGSNPREFDOC table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to IENGSNPREFDOC. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the IENGSNPREFDOC table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_IENGSNPREFDOC TYPE STANDARD TABLE OF IENGSNPREFDOC,
      WA_IENGSNPREFDOC TYPE IENGSNPREFDOC,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <IENGSNPREFDOC> TYPE IENGSNPREFDOC.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_IENGSNPREFDOC.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM IENGSNPREFDOC
  INTO TABLE IT_IENGSNPREFDOC.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IENGSNPREFDOC
*  INTO TABLE @DATA(IT_IENGSNPREFDOC2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_IENGSNPREFDOC INDEX 1 INTO DATA(WA_IENGSNPREFDOC2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_IENGSNPREFDOC ASSIGNING <IENGSNPREFDOC>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IENGSNPREFDOC>-MANDT = 1.
<IENGSNPREFDOC>-ENGSNAPSHOTREFUUID = 1.
<IENGSNPREFDOC>-DOCUMENTTYPE = 1.
<IENGSNPREFDOC>-DOCUMENTINFORECORD = 1.
<IENGSNPREFDOC>-DOCUMENTPART = 1.

ENDLOOP.

LOOP AT IT_IENGSNPREFDOC INTO WA_IENGSNPREFDOC.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IENGSNPREFDOC-DOCUMENTVERSION, sy-vline,
  WA_IENGSNPREFDOC-ENGSNAPSHOTUUID, sy-vline,
  WA_IENGSNPREFDOC-ENGSNAPSHOTID, sy-vline,
  WA_IENGSNPREFDOC-ENGSNPSHTREVISIONNUMBER, sy-vline,
  WA_IENGSNPREFDOC-ENGSNPSHTREFTYPE, sy-vline,
  WA_IENGSNPREFDOC-INTERNALDOCUMENTSTATUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IENGSNPREFDOC you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_IENGSNPREFDOC TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_IENGSNPREFDOC INTO WA_IENGSNPREFDOC.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field DOCUMENTINFORECORD
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IENGSNPREFDOC-DOCUMENTINFORECORD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IENGSNPREFDOC-DOCUMENTINFORECORD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ENGSNAPSHOTID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IENGSNPREFDOC-ENGSNAPSHOTID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IENGSNPREFDOC-ENGSNAPSHOTID.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_IENGSNPREFDOC_STR, 
MANDT TYPE STRING,
ENGSNAPSHOTREFUUID TYPE STRING,
DOCUMENTTYPE TYPE STRING,
DOCUMENTINFORECORD TYPE STRING,
DOCUMENTPART TYPE STRING,
DOCUMENTVERSION TYPE STRING,
ENGSNAPSHOTUUID TYPE STRING,
ENGSNAPSHOTID TYPE STRING,
ENGSNPSHTREVISIONNUMBER TYPE STRING,
ENGSNPSHTREFTYPE TYPE STRING,
INTERNALDOCUMENTSTATUS TYPE STRING,
CREATEDBYUSER TYPE STRING,
CREATIONDATETIME TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,
DOCUMENTDESCRIPTION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IENGSNPREFDOC_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_IENGSNPREFDOC_STR-MANDT sy-vline 
WA_IENGSNPREFDOC_STR-ENGSNAPSHOTREFUUID sy-vline 
WA_IENGSNPREFDOC_STR-DOCUMENTTYPE sy-vline 
WA_IENGSNPREFDOC_STR-DOCUMENTINFORECORD sy-vline 
WA_IENGSNPREFDOC_STR-DOCUMENTPART sy-vline 
WA_IENGSNPREFDOC_STR-DOCUMENTVERSION sy-vline 
WA_IENGSNPREFDOC_STR-ENGSNAPSHOTUUID sy-vline 
WA_IENGSNPREFDOC_STR-ENGSNAPSHOTID sy-vline 
WA_IENGSNPREFDOC_STR-ENGSNPSHTREVISIONNUMBER sy-vline 
WA_IENGSNPREFDOC_STR-ENGSNPSHTREFTYPE sy-vline 
WA_IENGSNPREFDOC_STR-INTERNALDOCUMENTSTATUS sy-vline 
WA_IENGSNPREFDOC_STR-CREATEDBYUSER sy-vline 
WA_IENGSNPREFDOC_STR-CREATIONDATETIME sy-vline 
WA_IENGSNPREFDOC_STR-LASTCHANGEDBYUSER sy-vline 
WA_IENGSNPREFDOC_STR-LASTCHANGEDATETIME sy-vline 
WA_IENGSNPREFDOC_STR-DOCUMENTDESCRIPTION sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.